Which best show how fossil fuels form?

Fossil fuels form from the remains of ancient plants and animals that were buried under layers of sediment and subjected to heat and pressure over millions of years. This process, known as diagenesis, transforms organic matter into coal, oil, or natural gas. The specific type of fossil fuel formed depends on the original material and the conditions of temperature and pressure during the transformation. Ultimately, fossil fuels are a concentrated energy source derived from the stored energy of prehistoric life.